Not sure if you've got an answer on this yet ... but better late than never ... as I just had to figure this out today.
This answer applies if you executing your dump command as root.
dumping to a remote tape drive involves using rmt. rmt is executed via rsh on the remote. By default many systems don't allow root access via rsh out of the box. On Red Hat Linux you can enable it by adding the line "rsh" (without the quotes) to /etc/securetty. This file contains the "devices" that root is allowed to logon.
Note enabling root access via rsh could open a security hole on your machine unless its well protected. So understand the ramifications of this change before applying it.
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